adding fields to lua class from C++

Hi all, 

 

I'm working on pseudo-dynamic fields for the lua classes. What I want to
achieve is some sort of mapping of object fields available from C++. So my
script class will populate the fields map like:

 

function myClass:populateDynamicFields()

  addDynamicField('field1', int)

  addDynamicField('field2', string)

end

 

then from GUI I want to display this list of dynamic fields and be able to
set their values via get/setValueInt (eventually I would like to add fields
from GUI as well). These methods will basically look like below:

 

void myClassInterface::setValueInt(string name, int value)

{

  // let's say that I have luabind::object that is the script class
representation in luabind and it's called m_Self

  if (m_Self[name])

  {

    m_Self[name] = value;

  }

}

 

What I don't know is how to ensure that the m_Self[name] exists? Or how to
force its creation from C++ side? Like:

 

// .

if (!m_Self[name])

  // do something to create field

 

Is there some way to do this? Or maybe there is some more generic way to do
what I'm trying here?

 

Thanks a lot.

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